Houston Texans H Jacksonville Jaguars A Detroit Lions A Miami Dolphins H Indianapolis Colts H Kansas City Chiefs H Chicago Bears A Alex Gray has gone from missing out on a silver medal at the Rio Olympics to changing sports and playing for the Atlanta Falcons.

Our guide to everything you need to know about American football and how you can get involved in your own 'game day'.

Are you an NFL rookie? If so, watch our guide to the key rules, the player positions and the ultimate aim of the game. How to get into American football — a sport for all shapes and sizes that requires both mental and physical skills.

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